vassal do not ultimatum help

[Dreamsbird]

l want my vassal do ultimatum with 150~200% strength (at least)
so edit faction_decision file

but sadly my vassal do not ultimatum
already they over 300%++ strength

anyone can give me some help?

// faction_decisions file //

        ai_will_do = {
            factor = 1
          
            modifier = {
                factor = 0
                NOT = {
                    faction_power =
                    {
                        faction = faction_claimant
                        power = 0.75
                    }
                }
            }
          
            modifier = {
                factor = 0.1
                NOT = {
                    faction_power =
                    {
                        faction = faction_claimant
                        power = 1.5 // 1.0 -> 1.5
                    }
                }
            } 



            modifier = {
                factor = 0.1
                NOT = {
                    faction_power =
                    {
                        faction = faction_claimant
                        power = 2.0 // 1.5 -> 2.0
                    }
                }
            }